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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.util;
import java.util.HashSet;
import java.util.Set;
import org.json.JSONArray;
import org.json.JSONException;
import org.mozilla.gecko.AppConstants.Versions;
import android.content.SharedPreferences;
import android.util.Log;
public class PrefUtils {
private static final String LOGTAG = "GeckoPrefUtils";
// Cross version compatible way to get a string set from a pref
public static Set<String> getStringSet(final SharedPreferences prefs,
final String key,
final Set<String> defaultVal) {
if (!prefs.contains(key)) {
return defaultVal;
}
// If this is Android version >= 11, try to use a Set<String>.
try {
return prefs.getStringSet(key, new HashSet<String>());
} catch (ClassCastException ex) {
// A ClassCastException means we've upgraded from a pre-v11 Android to a new one
final Set<String> val = getFromJSON(prefs, key);
SharedPreferences.Editor edit = prefs.edit();
putStringSet(edit, key, val).apply();
return val;
}
}
private static Set<String> getFromJSON(SharedPreferences prefs, String key) {
try {
final String val = prefs.getString(key, "[]");
return JSONUtils.parseStringSet(new JSONArray(val));
} catch (JSONException ex) {
Log.i(LOGTAG, "Unable to parse JSON", ex);
}
return new HashSet<String>();
}
/**
* Cross version compatible way to save a set of strings.
* <p>
* This method <b>does not commit</b> any transaction. It is up to callers
* to commit.
*
* @param editor to write to.
* @param key to write.
* @param vals comprising string set.
* @return
*/
public static SharedPreferences.Editor putStringSet(final SharedPreferences.Editor editor,
final String key,
final Set<String> vals) {
editor.putStringSet(key, vals);
return editor;
}
}
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